1. Main Linac Beam Optics and Tolerances
W. Decking
DESY
Winni Decking

2. Linac beam optics 60 deg , 24 m long FODO
Individually powered quadrupoles
One steerer per quadrupole
String connection boxes ‘perturb’ periodicity

3. Tolerances – Energy Profile
Assume 1 % RMS error in energy gain knowledge (or 1 % error in quadrupole gradient)

4. Tolerance – Orbit Error
R56 : +10 mm for +2% initial energy deviation
R56 : +1.5 mm for +2% initial energy deviation

5. Summary
Tolerances in LINAC rather relaxed
Energy management needed
BPM resolution of 50 mm (single bunch) sufficient
Alignment of quads, cavities, modules: 500 mm
Cavity tilts 0.25 mrad
No number for quad tilts yet

6. Single Bunch Emittance Growth due to Short Range TESLA Cavity Wakes
V. Tsakanov, G. Amatuni, W. Decking, R. Brinkmann
CANDLE
DESY
Talk based on FLS2006 presentation by V. Tsakanov
Winni Decking

9. Results cavity & module misalignments cavity tilts
emittance growth after trajectory correction
quadrupole offset - trajectory

11. Summary
Chromatic effects dominate
Initial offset, cavity misalignment etc. lead to increase off energy spread and emittance dilution in the order of one percent
Cavity tilts and quadrupole misalignment lead to off-axis beam trajectory in the order of a few mm and emittance dilution of a few percent (if not corrected)
Only cavity wakes considered